复杂应力状态下钙质砂的动强度  

Dynamic Strength of Carbonate Sand in Complex Stress State

作　　者：虞海珍[1] 赵文光[1] 汪稔[2] 李建国[2] 许成顺[3] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]中科院武汉岩土力学研究所,湖北武汉430070 [3]大连理工大学岩土工程研究所,辽宁大连116024

出　　处：《华中科技大学学报（城市科学版）》2005年第1期40-43,48,共5页Journal of Huazhong University of Science and Technology

摘　　要：利用土工静力-动力液压三轴-扭剪多功能剪切仪模拟海洋波浪的加载形式,对相对密度为30%的钙质砂进行了扭转和竖向耦合循环剪切试验,着重研究了复杂应力状态下初始主应力方向角α0和中主应力系数b对钙质砂动强度特性的影响.研究表明:初始主应力方向对钙质砂的动强度具有显著的影响,随着初始主应力方向角α0的增大,动强度明显降低,且降低的程度随破坏振动次数的增加而增加;b值对动强度也有影响,影响程度与α0相比要小.The soil static and dynamic universal triaxial and torsional shear apparatus which can simulate the cyclic stress characteristic of sand on seabed is used to perform experimental tests of loose carbonate sands with a relative density of 30% subjected to vertical-and-torsional coupling cyclic shear with the rotation of principal stress axes induced by ocean wave. The tests are carried out to investigate the effect of initial orientation of principle stress axes and the parameter of intermediate principal stress b on dynamic strength of carbonate sand under anisotropic consolidation condition. The results of the tests show that the rotation angle of initial principal stress α_0 affects dynamic strength of carbonate sand significantly. With the increase of α_0, dynamic strength decreases obviously, and the degree of strength lowing increases with the increment of the number of cyclics. The value of b has some influence on the dynamic strength of carbonate sand.

关 键 词：波浪荷载 耦合剪切试验 钙质砂 动强度 初始主应力方向 中主应力系数 

分 类 号：TU411.8[建筑科学—岩土工程] TU447[建筑科学—土工工程]